Topic
Antimony
About: Antimony is a research topic. Over the lifetime, 11450 publications have been published within this topic receiving 155660 citations. The topic is also known as: Sb & element 51.
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TL;DR: In this paper, a new method was developed for the simultaneous speciation of inorganic arsenic and antimony in water by on-line solid-phase extraction coupled with hydride generation-double channel atomic fluorescence spectrometry (HG-DC-AFS).
102 citations
TL;DR: Porewater profiles indicate that the dissolution of manganese and iron oxyhydroxides under anoxic conditions leads to the simultaneous release of dissolved Sb previously sorbed onto those compounds, in reducing sediments, the control of the solubility of Sb by iron sulfides is suggested.
Abstract: The study identifies the role played by different components of natural aquatic systems on the poorly known geochemistry of antimony. Different chemical forms of antimony were measured in porewaters and sediments of two Sudbury lakes characterized by contrasting redox conditions at the sediment−water interface. In porewaters, Sb(III) was present under reducing conditions where it could exist as SbS2- according to thermodynamic calculations. Sb(V) was detected mainly under oxic and mildly reducing environments where its presence was attributed to the oxidizing effect of iron and manganese oxyhydroxides or to the slow kinetics of reduction by dissolved sulfide or possible complexation by it. A third form of Sb identified as refractory was obtained after UV irradiation of the water samples, suggesting an association of Sb to low molecular weight natural organic matter. The distribution of Sb in sediments of the two lakes revealed (through the comparison of profiles and statistical correlations) the importanc...
102 citations
TL;DR: Results suggest that Sb(III/V) adsorption exhibited a bidentate binuclear surface complex, and the change in orbital energy derived from orbital hybridizing of adsorbed Sb on surfaces is the driving force underlining the Sb surface chemistry.
Abstract: Antimony (Sb) contamination poses an emerging environmental risk, whereas its removal remains a contemporary challenge due to the lack of knowledge in its surface chemistry and efficient adsorbent. In this study, self-assembly {001} TiO2 was examined for its effectiveness in Sb removal, and the molecular level surface chemistry was studied with X-ray absorption spectroscopy and density functional theory calculations. The kinetics results show that Sb adsorption followed the pseudo-second order reaction, and the Langmuir adsorption capacity was 200 mg/g for Sb(III) and 156 mg/g for Sb(V). The PZC of TiO2, which was 6.6 prior to the adsorption experiment, shifted to 4.8 and <0 after adsorption of Sb(III) and Sb(V), respectively, indicating the formation of negatively charged inner-sphere complexes. EXAFS results suggest that Sb(III/V) adsorption exhibited a bidentate binuclear surface complex. The orbital hybridizing of complexes was studied by XANES, molecular orbital theory (MO), and density of states (DO...
100 citations
TL;DR: The thermoeiectric properties of an alloy of 88 at.% bismuth and 12 at.%. antimony in transverse magnetic fields up to 17,000 Ce are reported as discussed by the authors.
Abstract: The thermoeiectric properties of an alloy of 88 at.% bismuth and 12 at.% antimony in transverse magnetic fields up to 17,000 Ce are reported. Graphs of variation of resistivity with magnetic field strength and of variation of thermoelectric figure of merit with temperature show that resistivity rises with field strength. Magnetothermoelectric results with pure bismuth are similar to those for this alloy. (D.C.W.)
100 citations
TL;DR: A novel open antimony sulfide framework of composition – Sb3S5– has been synthesized hydrothermally, in the presence of tetramethyl ammonium ions, and determination of the crystal structure demonstrates that the (Me4N)+ molecules occlude a system of intersecting channels at 90� to one another.
Abstract: A novel open antimony sulfide framework of composition [Sb(3)S(5)](-) has been synthesized hydrothermally, in the presence of tetramethyl ammonium ions. Determination of the crystal structure demonstrates that the (Me(4)N)(+) molecules (Me, methyl) occlude a system of intersecting channels at 90 degrees to one another. The three-dimensional framework is assembled from a new building unit, flat s-shaped buckled sheets of edge-linked 4-rings containing Sb(2)S(2) moieties. These are cross-linked in two directions to form the system of channels.
100 citations